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 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.

 // Use of this source code is governed by a BSD-style license that can be

 // found in the LICENSE file.

 #ifndef BASE_PORT_H_

 #define BASE_PORT_H_

 #include <stdarg.h>

 #include "build/build_config.h"

 #ifdef COMPILER_MSVC

 #define GG_LONGLONG(x) x##I64

 #define GG_ULONGLONG(x) x##UI64

 #else

 #define GG_LONGLONG(x) x##LL

 #define GG_ULONGLONG(x) x##ULL

 #endif

 // Per C99 7.8.14, define __STDC_CONSTANT_MACROS before including <stdint.h>

 // to get the INTn_C and UINTn_C macros for integer constants.  It's difficult

 // to guarantee any specific ordering of header includes, so it's difficult to

 // guarantee that the INTn_C macros can be defined by including <stdint.h> at

 // any specific point.  Provide GG_INTn_C macros instead.

 #define GG_INT8_C(x)    (x)

 #define GG_INT16_C(x)   (x)

 #define GG_INT32_C(x)   (x)

 #define GG_INT64_C(x)   GG_LONGLONG(x)

 #define GG_UINT8_C(x)   (x ## U)

 #define GG_UINT16_C(x)  (x ## U)

 #define GG_UINT32_C(x)  (x ## U)

 #define GG_UINT64_C(x)  GG_ULONGLONG(x)

 namespace base {

 // It's possible for functions that use a va_list, such as StringPrintf, to

 // invalidate the data in it upon use.  The fix is to make a copy of the

 // structure before using it and use that copy instead.  va_copy is provided

 // for this purpose.  MSVC does not provide va_copy, so define an

 // implementation here.  It is not guaranteed that assignment is a copy, so the

 // StringUtil.VariableArgsFunc unit test tests this capability.

 // The C standard says that va_copy is a "macro", not a function.  Trying to 

 // use va_list as ref args to a function, as above, breaks some machines.

 #  if defined(COMPILER_GCC)

 #    define base_va_copy(_a, _b) ::va_copy(_a, _b)

 #  elif defined(COMPILER_MSVC)

 #    define base_va_copy(_a, _b) (_a = _b)

 #  else

 #    error No va_copy for your compiler

 #  endif

 }  // namespace base

 // Define an OS-neutral wrapper for shared library entry points

 #if defined(OS_WIN)

 #define API_CALL __stdcall

 #elif defined(OS_LINUX) || defined(OS_MACOSX)

 #define API_CALL

 #endif

 #endif  // BASE_PORT_H_